Clinical Overview
Dextroamphetamine is the dextrorotatory enantiomer of amphetamine, indicated for ADHD and narcolepsy. As a single-isomer formulation, it may provide similar efficacy to mixed amphetamine salts but with potentially different tolerability profiles and dosing requirements.
Primary Clinical Applications
Dextroamphetamine is indicated for ADHD in patients 3 years and older and narcolepsy in patients 6 years and older. It may be preferred for patients who experience side effects with mixed amphetamine salts or require more precise dosing adjustments. The medication is available in multiple formulations including immediate-release tablets, extended-release capsules, and liquid.
Mechanism and Clinical Benefits
Dextroamphetamine increases dopamine and norepinephrine by blocking reuptake and promoting release. The single-isomer formulation may provide more targeted neurotransmitter effects compared to mixed salts, potentially offering similar efficacy with different side effect profiles or dosing flexibility.
Formulation Advantages
Available as immediate-release tablets (Dexedrine, Zenzedi), extended-release capsules (Dexedrine Spansule), and liquid formulation (ProCentra), providing flexibility for different patient needs and ages. The liquid formulation is particularly useful for young children or patients who cannot swallow tablets.
Prescribing Information
Dosing & Administration
ADHD – Children (3-5 years):
- Initial: 2.5 mg once daily
- Titration: Increase by 2.5 mg weekly as needed
- Range: 2.5-40 mg daily in divided doses
ADHD – Children (6+ years):
- Initial: 5 mg once or twice daily
- Titration: Increase by 5 mg weekly
- Range: 5-40 mg daily
- Extended release: 5-15 mg once daily initially
ADHD – Adults:
- Initial: 5 mg once or twice daily
- Range: 5-60 mg daily in divided doses
- Extended release: 10-30 mg once daily
Narcolepsy:
- Children (6-12 years): 5 mg daily initially, increase by 5 mg weekly (maximum 60 mg daily)
- Adults: 10 mg daily initially, increase by 10 mg weekly (maximum 60 mg daily)
Administration:
- Give first dose upon awakening
- Immediate release: May divide into 2-3 doses, 4-6 hours apart
- Extended release: Once daily in morning
- Liquid: Measure with calibrated device
Indications
- Treatment of ADHD in patients 3 years and older
- Treatment of narcolepsy in patients 6 years and older
Contraindications
- Advanced arteriosclerosis, symptomatic cardiovascular disease
- Moderate to severe hypertension
- Hyperthyroidism, glaucoma
- Agitated states, history of drug abuse
- MAOI use within 14 days
- Known hypersensitivity to sympathomimetic amines
Warnings & Precautions
- Boxed Warning: High potential for abuse and dependence
- Cardiovascular effects: Monitor blood pressure and heart rate
- Psychiatric adverse reactions: May exacerbate psychosis, mania, or aggression
- Growth suppression: Monitor height and weight in pediatric patients
- Peripheral vasculopathy: Digital changes reported
- Visual disturbances: Difficulty with accommodation
Drug Interactions
- MAOIs: Contraindicated – hypertensive crisis risk
- Acidifying agents: Decrease dextroamphetamine levels
- Alkalinizing agents: Increase dextroamphetamine levels
- Tricyclic antidepressants: Enhanced cardiovascular effects
- Proton pump inhibitors: May alter absorption
Adverse Reactions
Common (>5%):
- Decreased appetite, insomnia, abdominal pain
- Emotional lability, fever, infection
- Loss of appetite, nervousness
Cardiovascular:
- Increased blood pressure and heart rate, palpitations
Serious:
- Sudden death (rare), psychosis, peripheral vasculopathy
Special Populations
- Pediatric: Monitor growth and development regularly
- Pregnancy: Category C – use only if benefits outweigh risks
- Liquid formulation: Contains sodium benzoate, use caution in neonates
- Schedule II: High abuse potential, requires monitoring and secure storage
Medical Disclaimer: This information is for educational purposes only and is not intended as medical advice. Always consult with qualified healthcare professionals before making any treatment decisions. Individual patient circumstances may vary significantly.
